FFmpeg
filmstripenc.c
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1 /*
2  * Adobe Filmstrip muxer
3  * Copyright (c) 2010 Peter Ross
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Adobe Filmstrip muxer
25  */
26 
27 #include "libavutil/intreadwrite.h"
28 #include "avformat.h"
29 #include "rawenc.h"
30 
31 #define RAND_TAG MKBETAG('R','a','n','d')
32 
34 {
35  if (s->streams[0]->codecpar->format != AV_PIX_FMT_RGBA) {
36  av_log(s, AV_LOG_ERROR, "only AV_PIX_FMT_RGBA is supported\n");
37  return AVERROR_INVALIDDATA;
38  }
39  return 0;
40 }
41 
43 {
44  AVIOContext *pb = s->pb;
45  AVStream *st = s->streams[0];
46  int i;
47 
48  avio_wb32(pb, RAND_TAG);
49  avio_wb32(pb, st->nb_frames);
50  avio_wb16(pb, 0); // packing method
51  avio_wb16(pb, 0); // reserved
52  avio_wb16(pb, st->codecpar->width);
53  avio_wb16(pb, st->codecpar->height);
54  avio_wb16(pb, 0); // leading
55  // TODO: should be avg_frame_rate
56  avio_wb16(pb, st->time_base.den / st->time_base.num);
57  for (i = 0; i < 16; i++)
58  avio_w8(pb, 0x00); // reserved
59 
60  return 0;
61 }
62 
64  .name = "filmstrip",
65  .long_name = NULL_IF_CONFIG_SMALL("Adobe Filmstrip"),
66  .extensions = "flm",
67  .audio_codec = AV_CODEC_ID_NONE,
68  .video_codec = AV_CODEC_ID_RAWVIDEO,
69  .write_header = write_header,
70  .write_packet = ff_raw_write_packet,
71  .write_trailer = write_trailer,
72 };
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int num
Numerator.
Definition: rational.h:59
static int write_trailer(AVFormatContext *s)
Definition: filmstripenc.c:42
Format I/O context.
Definition: avformat.h:1351
AVOutputFormat ff_filmstrip_muxer
Definition: filmstripenc.c:63
int width
Video only.
Definition: codec_par.h:126
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
#define av_log(a,...)
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
const char * name
Definition: avformat.h:500
#define s(width, name)
Definition: cbs_vp9.c:257
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawenc.c:29
Stream structure.
Definition: avformat.h:876
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:191
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:453
#define RAND_TAG
Definition: filmstripenc.c:31
Main libavformat public API header.
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:927
int den
Denominator.
Definition: rational.h:60
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:375
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:905
static int write_header(AVFormatContext *s)
Definition: filmstripenc.c:33